diff --git a/src/NadekoBot/Services/IBotCredentials.cs b/src/NadekoBot/Services/IBotCredentials.cs
index 88bc5986..a03c6db3 100644
--- a/src/NadekoBot/Services/IBotCredentials.cs
+++ b/src/NadekoBot/Services/IBotCredentials.cs
@@ -1,4 +1,6 @@
 using Discord;
+using System.Collections.Generic;
+using System.Collections.Immutable;
 
 namespace NadekoBot.Services
 {
@@ -9,7 +11,7 @@ namespace NadekoBot.Services
 
         string Token { get; }
         string GoogleApiKey { get; }
-        ulong[] OwnerIds { get; }
+        ImmutableHashSet<ulong> OwnerIds { get; }
         string MashapeKey { get; }
         string LoLApiKey { get; }
 
diff --git a/src/NadekoBot/Services/Impl/BotCredentials.cs b/src/NadekoBot/Services/Impl/BotCredentials.cs
index 47906e8c..56851762 100644
--- a/src/NadekoBot/Services/Impl/BotCredentials.cs
+++ b/src/NadekoBot/Services/Impl/BotCredentials.cs
@@ -5,6 +5,8 @@ using Discord;
 using System.Linq;
 using NLog;
 using Microsoft.Extensions.Configuration;
+using System.Collections.Generic;
+using System.Collections.Immutable;
 
 namespace NadekoBot.Services.Impl
 {
@@ -21,7 +23,7 @@ namespace NadekoBot.Services.Impl
 
         public string Token { get; }
 
-        public ulong[] OwnerIds { get; }
+        public ImmutableHashSet<ulong> OwnerIds { get; }
 
         public string LoLApiKey { get; }
         public string OsuApiKey { get; }
@@ -61,7 +63,7 @@ namespace NadekoBot.Services.Impl
                 Token = data[nameof(Token)];
                 if (string.IsNullOrWhiteSpace(Token))
                     throw new ArgumentNullException(nameof(Token), "Token is missing from credentials.json or Environment varibles.");
-                OwnerIds = data.GetSection("OwnerIds").GetChildren().Select(c => ulong.Parse(c.Value)).ToArray();
+                OwnerIds = data.GetSection("OwnerIds").GetChildren().Select(c => ulong.Parse(c.Value)).ToImmutableHashSet();
                 LoLApiKey = data[nameof(LoLApiKey)];
                 GoogleApiKey = data[nameof(GoogleApiKey)];
                 MashapeKey = data[nameof(MashapeKey)];